SDL_EventAction.3type - Man Page

#include <SDL3/SDL_events.h>

typedef enum SDL_EventAction
{
    SDL_ADDEVENT,  /**< Add events to the back of the queue. */
    SDL_PEEKEVENT, /**< Check but don't remove events from the queue front. */
    SDL_GETEVENT   /**< Retrieve/remove events from the front of the queue. */
} SDL_EventAction;

This enum is available since SDL 3.2.0.